Though much smaller and entirely round, the room somewhat resembled the Room of Requirement on the unforgettable occasion that it had transformed itself into a gigantic labyrinth comprised of centuries of hidden objects.

Deeper and deeper into the labyrinth he went, looking for objects he recognized from his one previous trip into the room.

There are no more uses of "labyrinth" in the book.

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The gutted structure crouches like a wounded animal amid a labyrinth of crumbling dwellings.

Sabaa Tahir -- An Ember in the Ashes

"I heard Mom say that the warlocks of the Spiral Labyrinth have been looking for a way to reverse the effects of the Infernal Cup," said Isabelle.